CVE-2023-0052 [Critical] | Security Vulnerability in Nova 220 Eyk220f001 Firmware

SAUTER Controls Nova 200–220 Series with firmware version 3.3-006 and prior and BACnetstac version 4.2.1 and prior allows the execution of commands without credentials. As Telnet and file transfer protocol (FTP) are the only protocols available for device management, an unauthorized user could access the system and modify the device configuration, which could result in the unauthorized user executing unrestricted malicious commands.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-01-22	0.10%	0.26%	+0.15%
2	2025-11-21	0.44%	0.10%	-0.34%
3	2025-11-18	—	0.44%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-01-22

0.10%

0.26%

+0.15%

2025-11-21

0.44%

0.10%

-0.34%

2025-11-18

—

0.44%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
9.8	3.1	CRITICAL	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	3.9	5.9	[email protected]
8.8	3.1	HIGH	`CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	2.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

9.8

3.1

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N): No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

3.9

5.9

[email protected]

8.8

3.1

HIGH

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Click to expand

Attack vector (AV:N): Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

2.8

5.9

[email protected]

Affected software / configurations for CVE-2023-0052

Vendor	Product	Version	Raw CPE
sauter-controls	nova_220_eyk220f001_firmware	<= 3.3-006	cpe:2.3:o:sauter-controls:nova_220_eyk220f001_firmware::::::::
sauter-controls	nova_230_eyk230f001_firmware	<= 3.3-006	cpe:2.3:o:sauter-controls:nova_230_eyk230f001_firmware::::::::
sauter-controls	nova_106_eyk300f001_firmware	<= 3.3-006	cpe:2.3:o:sauter-controls:nova_106_eyk300f001_firmware::::::::
sauter-controls	modunet300_ey-am300f001_firmware	<= 3.3-006	cpe:2.3:o:sauter-controls:modunet300_ey-am300f001_firmware::::::::
sauter-controls	modunet300_ey-am300f002_firmware	<= 3.3-006	cpe:2.3:o:sauter-controls:modunet300_ey-am300f002_firmware::::::::

References for CVE-2023-0052

URL	Tags
https://www.cisa.gov/uscert/ics/advisories/icsa-23-012-05	Third Party Advisory US Government Resource

URL

CVE-2023-0052 | SAUTER Controls Nova 200–220 Series Missing Authentication for Critical Function

Exploit prediction scoring system (EPSS) score for CVE-2023-0052

Common vulnerability scoring system (CVSS) metrics for CVE-2023-0052

Weakness enumeration for CVE-2023-0052

Affected software / configurations for CVE-2023-0052

References for CVE-2023-0052